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Modeling of two reactions with Mathematics and PDEs
Posted 2017年9月1日 GMT-4 13:27 Computational Fluid Dynamics (CFD), Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.3b, Version 4.4, Version 5.0, Version 5.1, Version 5.2, Version 5.2a, Version 5.3 0 Replies
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I am working on a model to simulate the hydration of MgCl2.2H2O to MgCl2.6H2O, with an intermidiate reaction MgCl2.2H2O -> MgCl2.4H2O.
In order to do it I use PDEs to calculate the water Mass balance (c) , the Temperature of air (Tair) and the Advancement of the reactions (X2->4 and X4->6 respectively ).
The kinetics of the reaction require a vapor pressure term , pv which i have defined as variable : pv_24=C_24*R*Tair and pv_46=C_46*R*Tair respectively for each reaction.
I use a segregated solver to calculate it but my problem is that I don't know how to make the simulation do the following :
To calculate the pv_24, then calculate the X_24, and after the C_24.
Then calculate in the same time step the pv_46 which will lead to an X_46 and after a C_46.
After all these in the same time step (in each spacial domain) to calculate the Tair.
If I have understood correctly, Comsol, calculates the variables first, and then all the PDEs.
Please I am relying on your help.
Thank you in advance for your time and help.
Hello Gerasimos Paraskevas
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